Drill-chuck.



No. 810,025. PLTLNTLD APR. 24, 1906.

G. R. RICH. DRILL 0500K.

APPLICATION FILED 0011.1010044 2 SHEETS-SHEET 1.

No. 819,025. PATBNTED APR. 24, 1906. G. R. RICH.

DRILL CHUCK.

APPLGATION ILED OCT. l0, 1904.

2 SHEETS-SEL 6.5565 ZM/PIQO/"J f 'A Mg Cam@ w UNITED STATES PATENTOFFICE.

GEORGE R. RICH, or CHICAGO, ILLINOIS, AssIGNOR To GEO. R. RICHMANUFACTURING COMPANY, OF BUCHANAN, MICHIGAN, A COR- DRILL-CHUCK.

Specification of Letters Patent.

. Patented April 24, 1906i Application filed October 10, 1904. SerialNo.l22'7,'791.

T0 all whom it may concern:

Be it known that I, GEORGE R. RICH, a citizen ofthe United States ofAmerica, residing at Chicago, in lthe county of Cook and State ofIllinois, have invented certain new and useful Improvements in DrillChucks, of which the J'following is a specification.

My invention relates to certain new and useful improvements indrill-chucks; and its object'is Vto produce a device of this class whichshall have certain advantages, which will appear more fully and at largein the course of this specification. l

To this end my invention consists incertain novel features ofconstruction, which are clearly illustrated in the accompanyingdrawings, and described in this specification.

In the aforesaid drawings Figure 1 is an' elevation of my improveddrilbchuck. Fig.

`2 is a central longitudinal section in the line 2.2 of Fig. 1. Fig. 3is a pers ective view of the drill-centering bushing. ig. 4 is aperspective view showing the chuckjaws removed from place. Fig. 5 is asection in the line 5 5 of Fi .'2 looking in the direction of the arrow.ig. 6 is a pers ective view of the backing-block ofthe chuc and thecrossbar by which it is advanced. Fig. 7 is an elevation of the upperortion of the chuck, showing the backing-b ook and said cross-bar, theadjusting-ring being moved from lace. Fig. 8 is an elevation of thelower en of a chuck, the clam ing-cap being shown in central longitudinasection in the line 2 2 of Fig. 1. Fig. 9 is a section in the line 9 9of Fig. 2, and Fig. 1'0 is a section in the line 10 10 of Fi 8.

teferring to the drawings, A is the body of my improved chuck, the samebeing formed from a-rod or. bar of steel rovided with a centrallongitudinally-exten ing cylindrical bore a,. ada ted to receive adrill. The body A is ,provi ed in its main portion with an externalscrew-thread, as illustrated, and has a reduced lower end A', which isalso externally screw-threaded. Within the cylindrical bore a of thebody A is a cylindrical backing-block B, movable longitudinally of thechuck, and

' this backing-block is provided with a transverse perforation throughwhich extends a cross-bar C, the ends oi which project through alongitudinal slot a in the body A of thel chuck. The ends of thiscross-bar are square, Figs. and 6, so as to be guided by the sides thecross-bar before the screws of the longitudinal slot a. Aring Dis threal5l 5 ed on the upper portion of the bod A, a y said ring is providedwith an interna annul r groove d, in which lie the heads of screwsscrewed into the ends ofthe cross-bar C. The

ring D is provided with a perforation d', 6o

bringing the ring D down over the ends of said cross-bar. The ring willp ss freely over 4 are inserted. After the parts have been placed inthis position the screws b are inserted and the parts of the deviceareirxr ly secured together. The 7o backing-block can then be moved up anddown the body of the drill with perfect ease by rotating the ring D.

The lower end of the chuck-body is provided with a transverse groove a2,the same being undercut at its upper end at a3. Two jaws Eaz'e providedbelow the lower end of the chuck-body, each of said jaws having asquared central upward projection e, whichlies in the transverse groovea2, the main por- 8 tions of the jaw tapering from top to bottorr.l Each.of lthe squared upward projections is provided at its outer top cornerswith lugs e', which engage with the undercut portion c3 at the top ofthe transverse groove a2. F screws upV over the reduced portion'A of thechuck-body and engages with the coned surfaces on the jaws to force themtogether upon the drill, which is shown at G. The arrangement of thelugs e is such that when 9o the cap is screwed down, so as to loosen thejaws, they will swing apart by gravity, hanging upon the lugs e. Inthis-way the drill can very readily be removed. A bushing H is providednear the lower end of the chuckbody, which acts to center the drill G,and in ractice a set of bushings of various internal diameters arefurnished with a single chuck,

so that drills of various sizes can be used.

It will be seen that the backing-block Bis .roo

backing-block to center the upper en d of the 1o 5 drill, for thebacking pressure of the drill itself forces it to the center of theconcave face.

A cap.85

I realize that oonsiderablevariation is possible in the details of thisconstruction Without departing from the spirit of the invention, and Ido not intend to limit myself to the s eoifio form hereinshown anddescribed.

I e aim as new and desire to secure by Letters Patent- In a device oftheclass described, the oombination with a hollow chuck-body provided witha longitudinal slot, of a backing-block longitudinally movable Withinthe chuck, projections on the backing-block extending out through theslot, a ring -on the chuckbody and engaging the projections on thebacking-block to move the saine lorygitudinally inthe chuck, jawsadapted tofgras a drill, and means for closing the jaws.. in efpendently of the movement of the backingblook.

In Witness whereof I have signed the above a plieation for LettersPatent, at Chieago,in t e county of Cook and State of Illinois, this21st day of September, A. D. 1904.

GEORGE R. RICH.

